This ideas is new to me but I've begun by painting the inside, so far. Think about painting the inside of your pots with Flex Seal. The product comes in white or black and paints on easily. I have not yet tried to paint the "rubber" itself, but plan to experiment by putting Flex Seal on a broken piece of pottery and then spray-painting it with clay-color paint -- or whatever color you like. Another option is to lightly sand the Flex Seal, then coat with yogurt, and then sprinkle moss on to "age" the container. You can buy moss "milkshake" material online. Clay-color spray paint appears to be only an online product and no longer available in the two hobby chains' stores. In any event. Flex Seal on the bottom of a clay pot will protect it from freeze-sticking to a smooth deck.
